Install VINTF fragment modules in the APEX

Currently APEX ignores vintf_fragments modules within the APEX, and all
VINTF fragments are installed with prebuilt_etc modules. This change
installs vintf_fragment modules in the APEX, so any additional
prebuilt_etc modules are not required as long as binaries define
vintf_fragment_modules references.

Bug: 363105686
Test: AOSP CF x86_64 build succeeded
Change-Id: I33b58178cd51dc2c4bb9226fdd68e7990dccd6a2
Merged-In: I33b58178cd51dc2c4bb9226fdd68e7990dccd6a2